:root{
  --ground:#efeadf; --paper:#f7f3ea; --ink:#1d2422; --mute:#5d6863; --rule:#d3cbbb;
  --jade:#2f6b5a; --azure:#2d4f7c; --cinnabar:#ad2a1d; --ochre:#9a6e26; --shade:#1a201e;
  --serif:"Spectral",Georgia,serif;
  --zh:"Noto Serif SC","Songti SC","SimSun",serif;
  --kai:"LXGW WenKai TC","Kaiti SC","STKaiti",serif;
}
@media (prefers-color-scheme:dark){:root:not([data-theme="light"]){
  --ground:#141a19; --paper:#1b2321; --ink:#e7e9e2; --mute:#9ea9a3; --rule:#33403c;
  --jade:#74b8a1; --azure:#8eb0db; --cinnabar:#e2654f; --ochre:#d4a85b; --shade:#0c100f;}}
:root[data-theme="dark"]{--ground:#141a19;--paper:#1b2321;--ink:#e7e9e2;--mute:#9ea9a3;--rule:#33403c;--jade:#74b8a1;--azure:#8eb0db;--cinnabar:#e2654f;--ochre:#d4a85b;--shade:#0c100f}

*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:var(--ground);color:var(--ink);font:19px/1.65 var(--serif);-webkit-font-smoothing:antialiased;overflow-x:hidden}
html[lang^="zh"] body{font:18px/1.9 var(--zh)}
a{color:var(--azure);text-underline-offset:3px}
:focus-visible{outline:2px solid var(--cinnabar);outline-offset:2px}
img{max-width:100%;height:auto;display:block}
.wrap{max-width:1120px;margin:0 auto;padding:0 16px}
.narrow{max-width:720px}

/* top bar */
.top{position:sticky;top:0;z-index:10;background:color-mix(in srgb,var(--ground) 88%,transparent);backdrop-filter:blur(8px);border-bottom:1px solid var(--rule)}
.top .wrap{display:flex;align-items:center;justify-content:space-between;height:56px;gap:16px}
.mark{display:flex;align-items:center;gap:10px;color:var(--ink);text-decoration:none;font:600 15px/1 var(--serif);letter-spacing:.22em;text-transform:uppercase}
.mark svg{width:22px;height:22px;flex:none}
.top nav{display:flex;align-items:center;gap:18px;font-size:15px}
.top nav a{color:var(--mute);text-decoration:none}
.top nav a:hover,.top nav a[aria-current="page"]{color:var(--ink)}
.lang{border:1px solid var(--rule);border-radius:999px;padding:3px 12px}

/* hero */
.hero{position:relative;color:#f4efe4;background:var(--shade);overflow:hidden}
.hero img.bg{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;opacity:.62}
.hero::after{content:"";position:absolute;inset:0;background:linear-gradient(90deg,rgba(12,16,15,.88) 0%,rgba(12,16,15,.55) 50%,rgba(12,16,15,.1) 100%)}
.hero .wrap{position:relative;z-index:1;padding-top:clamp(72px,14vh,140px);padding-bottom:clamp(64px,12vh,120px)}
.hero h1{margin:0;font:700 clamp(72px,13vw,148px)/.95 var(--kai);letter-spacing:.04em}
.hero .sub{margin:14px 0 0;font:400 clamp(22px,3vw,30px)/1.3 var(--serif);font-style:italic}
html[lang^="zh"] .hero .sub{font:500 clamp(20px,2.6vw,26px)/1.5 var(--zh);font-style:normal}
.hero .lede{max-width:560px;margin:22px 0 0;font-size:clamp(17px,1.9vw,20px);color:#e2dccf}
.seal{display:inline-block;margin-top:26px;padding:5px 12px;border:1px solid rgba(244,239,228,.5);border-radius:3px;font-size:14px;letter-spacing:.08em}
.seal b{color:#f0a493;font-weight:600}

.hero.home h1{font:600 clamp(40px,6.5vw,76px)/1.08 var(--serif);letter-spacing:-.01em;max-width:820px}
html[lang^="zh"] .hero.home h1{font:600 clamp(34px,5.4vw,60px)/1.3 var(--zh);letter-spacing:.02em}

/* sections */
section{padding:clamp(56px,9vw,104px) 0;border-bottom:1px solid var(--rule)}
section.alt{background:var(--paper)}
.kicker{margin:0 0 10px;font:600 13px/1 var(--serif);letter-spacing:.2em;text-transform:uppercase;color:var(--cinnabar)}
html[lang^="zh"] .kicker{font:600 14px/1 var(--zh);letter-spacing:.3em}
h2{margin:0 0 22px;font:600 clamp(30px,4.2vw,44px)/1.15 var(--serif)}
html[lang^="zh"] h2{font:600 clamp(26px,3.6vw,36px)/1.35 var(--zh)}
h3{margin:0 0 8px;font:600 21px/1.3 var(--serif)}
html[lang^="zh"] h3{font:600 19px/1.5 var(--zh)}
p{margin:0 0 1em}
.mute{color:var(--mute)}
.split{display:grid;grid-template-columns:1.1fr .9fr;gap:clamp(28px,5vw,64px);align-items:start}
.split.rev{grid-template-columns:.9fr 1.1fr}
figure{margin:0}
figure img{border-radius:4px;box-shadow:0 1px 0 var(--rule),0 18px 40px -24px rgba(0,0,0,.45)}
figcaption{margin-top:10px;font-size:14px;line-height:1.5;color:var(--mute)}
.sticky{position:sticky;top:84px}

/* timeline */
.timeline{list-style:none;margin:28px 0 0;padding:0;border-left:2px solid var(--rule)}
.timeline li{position:relative;padding:0 0 18px 24px}
.timeline li::before{content:"";position:absolute;left:-7px;top:9px;width:12px;height:12px;border-radius:50%;background:var(--ground);border:2px solid var(--ochre)}
.timeline li.end::before{background:var(--cinnabar);border-color:var(--cinnabar)}
.timeline .y{display:block;font:600 15px/1.4 var(--serif);color:var(--ochre);letter-spacing:.04em}
.timeline li.end .y{color:var(--cinnabar)}

/* principles */
.grid4{display:grid;grid-template-columns:repeat(2,1fr);gap:20px 40px;margin-top:36px}
.grid4 > div{padding-top:16px;border-top:2px solid var(--jade)}
.shots{display:grid;grid-template-columns:1fr 1fr;gap:20px;margin-top:48px}
.shots figure.wide{grid-column:1 / -1}

/* numbers */
.stats{display:grid;grid-template-columns:repeat(5,1fr);gap:16px;margin:32px 0 40px;padding:24px 0;border-top:1px solid var(--rule);border-bottom:1px solid var(--rule)}
.stats div{text-align:left}
.stats b{display:block;font:600 clamp(30px,4vw,42px)/1 var(--serif);color:var(--jade)}
.stats span{display:block;margin-top:8px;font-size:15px;line-height:1.4;color:var(--mute)}
.built{columns:2;column-gap:40px;padding-left:1.1em;margin:0}
.built li{break-inside:avoid;margin-bottom:10px}

/* roadmap */
.road{list-style:none;margin:36px 0 0;padding:0;counter-reset:road}
.road li{counter-increment:road;display:grid;grid-template-columns:64px 1fr;gap:8px 20px;padding:26px 0;border-top:1px solid var(--rule)}
.road li::before{content:counter(road,decimal-leading-zero);font:600 30px/1 var(--serif);color:var(--ochre)}
.road .tag{display:inline-block;margin-left:10px;padding:2px 9px;border-radius:999px;font:600 12px/1.6 var(--serif);letter-spacing:.06em;vertical-align:4px;background:color-mix(in srgb,var(--jade) 14%,transparent);color:var(--jade)}
.road .tag.next{background:color-mix(in srgb,var(--cinnabar) 13%,transparent);color:var(--cinnabar)}
.road p:last-child{margin-bottom:0}

/* home: game card */
.card{display:grid;grid-template-columns:1.2fr 1fr;background:var(--paper);border:1px solid var(--rule);border-radius:6px;overflow:hidden;color:inherit;text-decoration:none}
.card img{width:100%;height:100%;object-fit:cover;min-height:280px}
.card .body{padding:clamp(24px,4vw,44px)}
.card .title{font:700 64px/1 var(--kai);letter-spacing:.04em}
.card .en{margin:6px 0 18px;font:italic 22px/1.3 var(--serif);color:var(--mute)}
.card .go{display:inline-block;margin-top:8px;color:var(--cinnabar);font-weight:600}
.card:hover .go{text-decoration:underline}

footer{padding:40px 0 56px;font-size:15px;color:var(--mute)}
footer .wrap{display:flex;justify-content:space-between;gap:16px;flex-wrap:wrap}
footer a{color:var(--mute)}

@media (max-width:860px){
  .split,.split.rev,.card{grid-template-columns:1fr}
  .sticky{position:static}
  .split.rev > figure{order:2}
  .stats{grid-template-columns:repeat(2,1fr)}
  .built{columns:1}
  .grid4,.shots{grid-template-columns:1fr}
  .road li{grid-template-columns:44px 1fr}
  .road li::before{font-size:22px}
  .top nav .hide-sm{display:none}
  .hero::after{background:linear-gradient(180deg,rgba(12,16,15,.55) 0%,rgba(12,16,15,.88) 100%)}
}
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}}